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IS 14675 (1999) : Bottom Drafting Rollers for CHARKHAS [TXD 
14: Machinery for Fabric Manufacture] 




Jawaharlal Nehru 
'Step Out From the Old to the New' 



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PROTECTED BY COPYRIGHT 



IS 14675 : 1999 



Indian Standard 

BOTTOM DRAFTING ROLLERS FOR 
CHARKHAS — SPECIFICATION 



ICS 59. 120. 10 



©BIS 1999 

BUREAU OF INDIAN STANDARDS 

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG 
NEW DELHI 110002 

August 1999 Price Group 1 



Spinning Preparatory, Spinning and Doubling (Twisting) Machinery Sectional Committee, TX 15 



FOREWORD 

This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Spinning 
Preparatory, Spinning and Doubling (Twisting) Machinery Sectional Committee had been approved by the 
Textile Division Council. 

Preparation of Indian Standard on the subject was taken up at the request of Khadi and Village Industrial 
Commission, Mumbai which is a nodal agency for khadi production. It will ensure better performance of the 
CHARKHA as the requriements have been decided taking into consideration the length of roller and speed 
attained during hand spinning. 

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, 
observed or calculated, expressing the result of a test, shall be rounded off in accordance with IS 2 : 1960 'Rules 
for rounding off numerical values {revised)*. The number of significant places retained in the rounded off value 
should be the same that of the specified value in this standard. 



IS 14675 : 1999 



Indian Standard 

BOTTOM DRAFTING ROLLERS FOR 
CHARKHAS — SPECIFICATION 



1 SCOPE 

This standard precscribes requirements for both plain 
and antifriction bearing bottom rollers having fluted 
or knurled bosses for use in drafting systems of 
CHARKHA. 

2 REFERENCES 

The following standards contain provisions which 
through reference in this text, constitute provision of 
this standard. At the time of publication, the editions 
indicated were valid. All standards are subject to 
revision, and parties to agreements based on this 
standard are encouraged to investigate the possibility 
of applying the most recent editions of the standards 
indicated below : 

IS No. Title 

1030: 1989 Carbon steel castings for general 

engineering purposes (fourth 
revision) 

BEARING SIZE No.6000 



IS No. 
1586: 1988 

3 MATERIAL 



Title 

Method for Rockwell hardness test 
for metallic meterial (scales A-B- 
C-D-F-G-H-K (second revision) 



3.1 The drafting rollers having fluted on knurled boss 
shall be made from 20 MnCrS steel of any other 
suitable steel to achieve. The hardness and depth of 
case specified. 

3.2 Layout of Rollers 

The layout of bottom rollers shall be as illustrated in 
Fig. 1. 

3.3 Workmanship and Finish 

In the case of fluted rollers, the flutes shall not have 
any burrs or broken edges. However, at the edges of 
the boss broken flutes of less than 2 mm shall be 

BEARING SIZE No.6000 



"\T - 




Jt 25 * 5 


*23 




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T~ 







16 


31 


* 31 «- 


16 






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4*5 




- 33 .- 


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497 








591 






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CROSS KNURLING ROLLER, M.S., 1 OFF 



BEARING SIZE No.6000 



^25 



9S23-5 



^9-5 




FLUTED FRONT ROLLER, M.S., 1 OFF 56 FLUTED ±2 

^25 ^23-5 




FLUTED BACK ROLLER, M.S., 1 OFF 56 FLUTED 12 
All dimensions in millimetres. 

Fig. 1 Bottom Rollers for Systems for CHARKHAS 



IS 14675 : 1999 



permitted. In case of knurled rollers, the knurls shall 
be free from sharp edges. 

4 REQUIREMENTS 

4.1 The diameter of front and back fluted rollers shall 
be 25 mm and that of middle knurled roller shall be 
25,5 mm. The dimensions of rollers shall be subject to 
the following tolerances : 

Roller diameter ±0.05 mm 
Staff length ±0.1 mm 

Width of neck ±0.2 mm l Fo r plain bearing 
Diameter of neck +0.00 mm on i y an d j n case f 
-0.5 mm j antifriction bearing 
as per recommenda- 
tions of the bearing 
manufacturers. 

NOTE — Generally 
Bearing No. 6000 is 
used in these rollers. 

4.2 The hardness, depth of case and run-out of the 
rollers shall be as given in Table 1. 

Table 1 Requirements of Bottom Rollers 



SI Characteristics Requirement Method of Test 

No. 

(4) 



IS 1586 



(1) 


(2) (3) 


a) 


Hardness: 


i) 


Boss of bottom roller 50 to 55 HRC 
(see Note) 


ii) 


Plain bearing neck 

1 ) With inner race 30 HRC, Min 

2) Without inner race 56 HRC, Min 



b) Depth of case after 0.2 mm, Min Using a suitable 



grinding and 
polishing, mm 



5.2 The drafting rollers may also be marked with the 
Standard Mark. 

5.2.1 The use of the Standard Mark is governed by the 
provisions of Bureau of Indian Standards Act y \986 
and the Rules and Regulations made thereunder. The 
details of conditions under which the licence for the 
use of Standard Mark may be granted to manufacturers 
or producers may be obtained from the Bureau of 
Indian Standards. 

6 PACKING 

The drafting rollers shall be coated with 
rust-preventive agent and shall be packed as agreed 
between the buyer and the seller. 

7 SAMPLING 

7.1 Lot 

All the drafting rollers of same type and set of 
dimensions and manufactured from the same material 
under essentially similar conditions delivered to a 
buyer against one despatch note shall constitute a lot. 

7.2 Unless otherwise agreed to between the buyer and 
the seller, the number of drafting rollers to be selected 
for inspection shall be according to col 2 and 3 of 
Table 2. 

Table 2 Sample Size and Criteria 
for Conformity 



i Run-out (T1R) : 
Fluted roller 
Knurled roller 

1) Neck portion 
(plain bearing) 

2) Boss 

NOTE 



0.07 mm 



0.07 mm 



microscope with 

a magnifying power 
10 times and capable 
of measuring the 
depth of case to an 
accuracy of 0.05 mm 

With suitable 
micrometer dial 
gauge 



0.1 mm 
Hardness on boss is not applicable for knurled rollers. 



5 MARKING 

5.1 The box containing drafting rollers shall be 
marked with following: 

a) Name of material, 

b) Indication of the source of manufacture, 

c) Batch or Code number, and 

d) Number of drafting rollers in the box. 



SI 
No. 

(1) 
i) 
ii) 

iii) 



Lot Size 

(2) 
Up to 100 
101 to 150 
151 to 300 



Sample Size Acceptance No. 



iv) 301 and above 



(3) 
13 
20 

32 
50 



(4) 


1 



7.3 Criteria for Conformity 

The number of rollers to be inspected for various 
characteristics and the criteria for conformity shall be 
as follows: 

Characteristics Number of Rollers Criteria for 

to be Inspected Conformity 



Workmanship and According to col 3 
finish, dimensions, of Table 2 
tolerances, hardness 
and run-out 



Non-conformity 
rollers not to 
exceed corres- 
pondidng nuber 
given in col 4 of 
Table 2 



7.3.1 For depth of case, one roller from each lot shall 
be tested and shall meet the requirement specified. 



Bureau of Indian Standards 

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote 
harmonious development of the activities of standardization, marking and quality certification of goods 
and attending to connected matters in the country. 

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without the prior permission in writing of BIS. This does not preclude the free use, in the course of 
implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. 
Enquiries relating to copyright be addressed to the Director (Publications), BIS. 

Review of Indian Standards 

Amendments are issued to standards as the need arises on the basis of comments. Standards are also 
reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that 
no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users 
of Indian Standards should ascertain that they are in possession of the latest amendments or edition by 
referring to the latest issue of 'BIS Handbook' and 'Standards: Monthly Additions'. 

This Indian Standard has been developed from Doc : No. TX 15 (0326). 



Amendments Issued Since Publication 



Amend No. 



Date of Issue 



Text Affected 



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